import sys
from PySide2.QtWidgets import QApplication, QWidget, QVBoxLayout, QLineEdit, QLabel
from PySide2 import QtCore
app = QApplication(sys.argv)
hello_line_edit = QLineEdit()
world_label = QLabel("")
layout = QVBoxLayout()
layout.addWidget(hello_line_edit)
layout.addWidget(world_label)
hello_line_edit.connect(QtCore.SIGNAL('textChanged(QString)'), world_label, QtCore.SLOT('setText(QString)'))
#QtCore.QObject.connect(hello_line_edit, QtCore.SIGNAL('textChanged(QString)'), world_label, QtCore.SLOT('setText(QString)'))
window = QWidget()
window.setLayout(layout)
window.resize(200, 200)
window.show()
sys.exit(app.exec_())
